Driving-gear for rotary pulp-screens.



R. S. CLARKE.

DRIVING GEAR FOR ROTARY PULP SCREENS.

APPLICATION FILED JULY6, 1914.

1,1 38, 1 92. Patented May 4, 1915.

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RALPH S. CLARKE, OF WALPOLE, MASSACHUSETTS, ASSIGNOR TO WANDEL SCREENMANUFACTURING COMPANY, A. CORPORATION OF MASSACHUSETTS.

DRIVING-GEAR FOR ROTARY PULP-SCREENS.

Application filed July 6, 1914. Serial No. 849,159.

To all whom it may concern Be it known that I, RALPH S. CLARKE, acitizen of the United States, residing at lValpole, in the county ofNorfolk and State of Massachusetts, have invented certain new and usefulImprovements in Driving-Gear for Rotary Pulp-Screens, of which thefollowing is a specification, reference being had to the accompanyingdrawings, forming part thereof.

This invention relates to improvements in mechanism for effecting theintermittent rotation of the pulp gathering cylinders or screens of pulpscreening machines to progressively carry the pulp gathered thereby topositions to be acted upon by the water sprays.

One object of this invention is to simplify the construction of drivinggear for rotary pulp screens having vibratory movement in order toreduce the number of gears and their shafts and bearings with theirattaching devices.

Another object of the invention is to so construct a pulp screen havingduplex rotary pulp gathering screens and means for effecting vibratoryaction of said screens that the reaction of the screens is resisted in amanner to effect the intermittent rotation thereof.

Other objects of the invention will appear from the followingdescription.

The invention consists in such novel features of construction andcombination of parts as shall hereinafter be more fully described andpointed out in the claims.

Figure 1, represents an end elevation of a pulp gathering machine orscreen of the nature herein referred to and illustrating the newinvention, portions of the same being broken away. Fig. 2, represents aplan view of portions of the same.

Similar characters of reference designate corresponding partsthroughout.

Pulp gathering machines of the nature herein referred to usuallycomprise a vibratory pulp gathering member, ordinarily a cylindricalscreen, and mechanism for moving said member during its vibrationWhereby the pulp gathered by such member is moved to a point at which itis subjected to a shower of water which tends to carry the finerparticles of pulp through interstices of the screen or pulp gatheringmember, such screening operation being assisted by the Specification ofLetters Patent.

Patented May 4, 1915.

vibratory movement of the pulp gathering member. In machines of thischaracter in which rotary screens have been employed it has beencustomary to rotatably mount the screens in knocker arms, so called,pivotally mounted on the frame of the machine and having their endsfree, for a limited movement, and provision has been made by means ofrotatable knocker ratchets or cams having steps to vibrate said freeends of said knocker arms. The rotation of said screens has beeneffected through trains of gears mounted on shafts which latter arejournaled in bearings many of which are secured to the machine frame orparts of the machine by bolts. Under the continued strokes of theknocker cams against the striker blocks of the knocker arms thevibration of the parts is transmitted throughout the entire machine, thesecuring means for the various bearings and other parts of the machinebecome loosened while the shafts, their bearings, and the pitch pointsof the several gears become unduly worn.

As shown in the drawings but one end portion of the machine isillustrated, it being understood that the other end of the machine is ofapproximately similar construction. Parts of the machine heretofore wellknown and which do not necessarily form part of this invention are alsoomitted.

In carrying this invention into practice, I provide 'a pair of endframes as 5 between which is located the usual pulp pan or basin 6,indicated. The end frames as 5 have the studs 7, 7 on which are pivotedthe arms 8, 8 having the laterally extending bearings 9, 9, to receivejournaled members of the pulp screens, and the depending member 10, 10

provided withthe slidably adjustable blocks 11, 11 having the contractedfollowers 12, 12 having curved ends. In suitable bearings is journaledthe shaft 13 which may be rotatably driven in any usual or well knownmanner and is provided with the cams as 14 having the projections onspurs 15, 15 and the recesses or stops 16, 16 the outline of which is asuccession of regular curves, outward and inward whereby the end of thefollowers 12, 12 may follow said outline and may be at all timessustained thereby against the stress of the arms 8, 8.

The cylindrical screens 17, 17 are of any usual constructionand havingthe cylindrical end members 18, 18 which are rotatably sustained by thebearings 9, 9 of the arms 8, 8. On each of these cylindrical members 18,18 is clam ed the split collar 19 having the peripheral y grooved member20 and the perforated lugs 21, 21 which are drawn by the bolts 22, 22 toclamp the collar 19 to Mounted on the cylindrical member 18. frames as 5are the brackets 23, 23 having pivot pins 24, 24 carrying the eccentrics25, 25, which are rotatably adjustable on said pins and, on theperipheries of said eccentries 25, 25 are mounted the bearing rings 26,26 of the arms 27, 27 which arms have at their outer ends the wedges 28,28 shaped to frictionally engage the side walls of the peripheral groovein member 20 of collar 19. Springs 29, 29 are attached to said arms 2727 and to the studs 30, 3.0 fixed on the frames as 5 and said springsact constantly to draw the arms 27, 27 in directions to engage theirwedges 28, 28 with the grooves of members 20, 20 the points ofcoiiperation between said wedges and said grooves being determined bythe adjustment of the eccentrics 25, 25 whereby the extension of saidarms 27, 27

' from the axes of the pins 24, 24 may be varied.

By reference to Fig. 1 of the drawing it will be seen that when shaft 13and its cams as 14 are rotated the followers 12, 12 of the blocks 11, 11will rideoutward on the projections 15, 15 of said cams as 14 wherebythe free ends of arms 8, 8 will be caused to swing outward, thusswinging upward the I bearings 9, 9 of said arms 8, 8, and'moving thegrooved members 20, 20 in releasing directions relative to the wedges28, 28 until the highest points of said cam projections 15, 15 pass saidfollowers12, 12 after which said followers will follow inward on the peripheries of said cams until they reach the lowest points'of therecesses 16, 16. At the time the arms 8, 8 and their bearings 9, 9 begintheir reactive movement the tendency of the cylindrical screens 17 17 isto follow the movement of said bearings 9, 9 but such movementof thescreens 17, 17 is prevented by the engagement of the wedges 2.8, 28 withCopies of this patent maybe obtained 'for the grooved members 20, 20 ofcollars 19, 19 and such engagementof the wedges 28,28 is sufficient tosustain said collars 19, 19 and 7 their screens at peripheral pointswhile the overbalanced weight of the screenlaterally parts may dependsomewhat upon the size of the cam 14 or upon the speed at which it isdesired to rotate said cam, one purpose of this cam being to utilize therecesses or parts 16, 16 of the cams as 14 as stops to limit the inwardmovement of the followers 12, 12 toward the axis of the cams as 14without undue jar to the machinery where by the use of the cushionedbuffers ordinarily employed is avoided.

Having thus described my invention I claim as new and desire to secureby Letters Patent I I The combination with a pulp screen having abearing, means for effecting vibratory motion of said bearing, a pulpscreen having a cylindrical extension journaled in said bearing, a splitcollar clamped on said member and having a peripheral groove, a pinfixed on the machine frame, an eccentric sleeve rotatablefor adjustmenton said pin, an arm having a bearing sleeve embracing said eccentricand, at its free end a wedge adapted to'engage the groove of saidcollar, and a spring acting to draw said wedge arm toward said collar.

RALPH S. CLARKE. Witnesses:

WALTER M. LAINE, MILLARD, M. Emits.

five cents each, by addressing the Qommissioner of Patents,

Washington, D G.

